为何退出thread或者创建thread失败时，需要调用pthread_attr_destroy?

POSIX 标准要求:
   When a thread attributes object is no longer required, it should be destroyed using the pthread_attr_destroy() function.  Destroying a thread attributes object has no effect on threads that were created using that object.

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原文地址：https://www.cnblogs.com/eustoma/p/2415804.html